Lock



April 8 1924.

. E. P. BAIRD LOCK Filed May 2; 1919 mull IN Hil Patented Apr. 8, 1924- uun'uo STATES PATENT ounce."

EDWARD P. BAIBD, 01' EVANSTON, ILLINOIS. ASSIGNOR T CHICAGO CABINET LOCK comm, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

LOCK.

Application fled Kay 12, 1919. Serial No. 288,289.

To all whom it may concern:

Be it known that I EDWARD P. BAmo, a citizen of the United tates, and a resident of Evanston, in the county of Cook and e State of Illinois, have invented certain new and useful Improvements in Locks, of which the following is a full, clear, and exact descrition.

' invention relates to locks and more 10 particularly to cylinder locks of that t m which plate-tumblers are used.

The object of the invention is to provide a lock of this type which is eiiicient in operetion and which cannot be picked or operlo uted without a correct key.

The invention consists in the severel novel features hereinafter set forth end more particularly defined by claims st the conclusion hereof.

In the drawings: Fig. l is a. vertical longitudinal section of u look emying the invention. lFi '2 is a section taken on the line 2-2 of Fig. 1. Fig. 3 is a horizontal longitudinal section. Fig. 4 is a rear 235 end elevation and Fig. 5 is it view similar to Fig. l, the key being inserted. Fig. 6

is a detail of one of the tumblers. Fig. l

is o detail side elevation of one of the 1. plates for holding the tumblers in igneui all position. Fig. 8 is a sectional view of e modification with shoulders 21 ed. 4

A cylindrieel cesing 8 is opted to re tntnbly sustain n, carrier '9 in which plateturnblers 10 are menu to slide tronsversely into pockets or openings 1.2 formed in the casing, so that w the end of any of the tumblers end into the casing, the

carrier cannot be rotated and so that when the tumbler is held in proper "we e b w n key all of the tblers will b ret from the casing to render the carrier rotatable by e key 13. Studs 14.- are red to the rear end of the carrier and may be connected to operate the bolts of the lock in any manner, as well understood in the art.

ln the exemplification of the invention shown, the tumblers 10 are arranged in series which are spaced apart by ribs -15 in the guide-way 16 in the carrier for the tblers. The key 13 is provided with similerly sha ed edges 13' and 13 to pass through is e slots 10 in the tumblers and so that the key is adapted to move each tumbler picked.

transversely in either direction. A spring plate 18 is interposed between a pair of the tumblers of each series to cause the latter to be frictionz lly held in the guide-way '16. This friction-plate holds the tumblers so that force will be required to move the tumblers in either direction, is normally 6K curved, as shown in Fig. 7, and is provided with a slot through which the key passesv so that it will be withdrawn from the cerrier with the tumblers.

The front and rear portions of the casing are provided with a suitable slot 19 to receive and hold the he in such meer t, when the carrier is re eased, it can be rote. by the key.

An important feature of the present in vention consists in provig' means on the tumblers for holding them ainst tra verse movement it attempt is made to pick the tumblers into released position end to hold them there by rotation of the in er. For the purpose of preventing this being done, each tumbler is provided at each of its'ends and at each side thereof with a stop lug 20. In practice, attempts are sometimes made to insert it wire throu h the key-slot 19 and to successively move t e tumblers transversely into released position end to ascertain or frictionelly hold them such position by exerting slight rotetive pressure upon the carrier.

I en that is done and the tumblers ere provided with stop-lugs 20, said lugs es the waili oi the rotative on tlm carrier, lap one of the shoulders 21 to in guideway 12 in the casing. As a result, when rotative pressure is exerted upon the carrier, the sto lugs of all tblers not in releasing position will, at one side or the other of the carrier, interlock with the easin and be secured egeinst movement in t guide-way until the carrier is rotated to bring the tumblers in neutral position. This feature thus provides means for preventing the plate-tumblers from being In operation, the tumblers will be in iiregular position, as shown in Fig; 1. As the key 13 is withdrawn, each tumbler will project either at one end or the other into the casing to secure the carrier against rotation. When a key 13 is inserted, it will withdraw all of the tmnblers into the car- .s are omitted and the stop lugs 20, in lieu of engaging such shoulders, will engage a peripheral portion of the carrier adjacent the guide-way 16 whenthe carrier is subjected to rotative pressure. It willbe under stood that these tumblers have a slight play in the carrier, so that when the stop-lug 20 at one side en the side of the recess 12, the stop lug at the other side will be forced to lap a peripheral portion of the carrier.

The invention is not to be understood as restricted to the details set forth, since these may be modified within the scope oi the appended claims, without departing from the spirit and scope of the invention.

Havin thus described the invention, whet c aim as new'and desire to secure by Letmrs Patent, is:

1., in a cylinder lock, the. combination of acasing, a carrier rotatable in the casing having a transverse guideway therein extending therethrou'gh, key-opcrable plate tum blers, transversely slideble in said guideway and into interlocking relation with the casing, and resilient means for frictionally v holding the tumblers to any position into which they are shifted. a

2. In a cylinder-lock, the combination of a casing, a carrier rotatable in the having a transverse guide-way extending therethrough, key-operable plate-tumblers transversely slidable in said guide-way and into interlocking relation with the casing and spring-plates between the tumblers.

EDWARD P." BAIRIL. 

